Arnold, 33, was convicted of murdering her 28-day-old daughter, Paris Talley, by placing the baby in a microwave and "cooking" her in August 2005.
Prosecutors say Arnold put the baby in the microwave after a drunken argument with her boyfriend over whether the infant was his biological daughter.
Arnold was tried three times, with the death penalty a possibility each time. Her first trial in February 2008 ended in a mistrial.
Her second trial ended in September 2008 when she was found guilty but the jury could not decide on the death penalty. Montgomery County Common Pleas Judge Mary Wiseman imposed a sentence of life in prison, but that decision ultimately was overturned on appeal in November 2010.
In the third trial, which ended in May 2011, Arnold was sentenced to life in prison without the possibility of a parole after a jury did not vote for the death penalty. Defense attorney Christopher Thompson listed multiple possible trial court errors in the third trial in his filed brief.
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